Whether the EPA's denial of small refinery hardship exemption petitions under the Clean Air Act's Renewable Fuel Standard program is a "nationally applicable regulation" or "final action" subject to exclusive review in the D.C. Circuit under 42 U.S.C. 7607(b)(1), or whether such denials are "locally or regionally applicable" actions subject to review in the regional court of appeals.

Whether the Clean Air Act's venue provision requires judicial review of EPA small refinery exemption denials to be filed exclusively in the D.C. Circuit when the agency's action is not deemed 'nationally applicable'